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143 lines
4 KiB
C
143 lines
4 KiB
C
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/*
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* PROJECT: Filesystem Filter Manager
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: drivers/filters/fltmgr/Misc.c
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* PURPOSE: Uncataloged functions
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* PROGRAMMERS: Ged Murphy (gedmurphy@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include "fltmgr.h"
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#include "fltmgrint.h"
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#define NDEBUG
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#include <debug.h>
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/* DATA *********************************************************************/
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#define REG_SERVICES_KEY L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\"
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#define REG_PATH_LENGTH 512
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/* INTERNAL FUNCTIONS ******************************************************/
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NTSTATUS
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FltpOpenFilterServicesKey(
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_In_ PFLT_FILTER Filter,
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_In_ ACCESS_MASK DesiredAccess,
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_In_opt_ PUNICODE_STRING SubKey,
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_Out_ PHANDLE Handle)
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{
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OBJECT_ATTRIBUTES ObjectAttributes;
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UNICODE_STRING ServicesKey;
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UNICODE_STRING Path;
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WCHAR Buffer[REG_PATH_LENGTH];
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/* Setup a local buffer to hold the services key path */
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Path.Length = 0;
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Path.MaximumLength = REG_PATH_LENGTH;
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Path.Buffer = Buffer;
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/* Build up the serices key name */
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RtlInitUnicodeString(&ServicesKey, REG_SERVICES_KEY);
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RtlCopyUnicodeString(&Path, &ServicesKey);
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RtlAppendUnicodeStringToString(&Path, &Filter->Name);
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if (SubKey)
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{
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/* Tag on any child key */
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RtlAppendUnicodeToString(&Path, L"\\");
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RtlAppendUnicodeStringToString(&Path, SubKey);
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}
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InitializeObjectAttributes(&ObjectAttributes,
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&Path,
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OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
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NULL,
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NULL);
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/* Open and return the key handle param*/
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return ZwOpenKey(Handle, DesiredAccess, &ObjectAttributes);
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}
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NTSTATUS
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FltpReadRegistryValue(_In_ HANDLE KeyHandle,
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_In_ PUNICODE_STRING ValueName,
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_In_opt_ ULONG Type,
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_Out_writes_bytes_(BufferSize) PVOID Buffer,
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_In_ ULONG BufferSize,
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_Out_opt_ PULONG BytesRequired)
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{
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PKEY_VALUE_PARTIAL_INFORMATION Value = NULL;
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ULONG ValueLength = 0;
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NTSTATUS Status;
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PAGED_CODE();
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/* Get the size of the buffer required to hold the string */
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Status = ZwQueryValueKey(KeyHandle,
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ValueName,
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KeyValuePartialInformation,
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NULL,
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0,
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&ValueLength);
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if (Status != STATUS_BUFFER_TOO_SMALL && Status != STATUS_BUFFER_OVERFLOW)
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{
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return Status;
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}
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/* Allocate the buffer */
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Value = (PKEY_VALUE_PARTIAL_INFORMATION)ExAllocatePoolWithTag(PagedPool,
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ValueLength,
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FM_TAG_TEMP_REGISTRY);
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if (Value == NULL)
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{
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Status = STATUS_INSUFFICIENT_RESOURCES;
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goto Quit;
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}
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/* Now read in the value */
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Status = ZwQueryValueKey(KeyHandle,
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ValueName,
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KeyValuePartialInformation,
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Value,
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ValueLength,
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&ValueLength);
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if (!NT_SUCCESS(Status))
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{
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goto Quit;
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}
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/* Make sure we got the type expected */
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if (Value->Type != Type)
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{
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Status = STATUS_INVALID_PARAMETER;
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goto Quit;
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}
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if (BytesRequired)
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{
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*BytesRequired = Value->DataLength;
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}
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/* Make sure the caller buffer is big enough to hold the data */
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if (!BufferSize || BufferSize < Value->DataLength)
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{
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Status = STATUS_BUFFER_TOO_SMALL;
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goto Quit;
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}
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/* Copy the data into the caller buffer */
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RtlCopyMemory(Buffer, Value->Data, Value->DataLength);
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Quit:
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if (Value)
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ExFreePoolWithTag(Value, FM_TAG_TEMP_REGISTRY);
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return Status;
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}
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